UBUNTU-CVE-2026-100691 (CVE-2026-100691)
Vulnerability from osv_ubuntu – Published: 2026-09-29 00:00 – Updated: 2026-09-29 00:00 – Source website
VLAI
Details
Hugo versions 0.75.0 through 0.165.x contain a stored cross-site scripting vulnerability: the syntax highlighter does not escape the lineAnchors option before passing it to Chroma, which writes the value verbatim into the id and href attributes of the generated line-number markup. A crafted lineAnchors value supplied as a Markdown code fence attribute (or passed to the highlight template function) results in unescaped HTML in the rendered page, allowing arbitrary JavaScript to execute in the browsers of visitors to the generated site. This affects sites that build and publish Markdown from untrusted contributors; Hugo's security model otherwise considers content trusted input. Fixed in 0.166.0, where the lineAnchors value is HTML-escaped before being passed to Chroma.
Severity
5.4 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-spf13-hugo-dev",
"binary_version": "0.15+git20160206.203.ed23711-1"
},
{
"binary_name": "hugo",
"binary_version": "0.15+git20160206.203.ed23711-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "hugo",
"purl": "pkg:deb/ubuntu/hugo@0.15+git20160206.203.ed23711-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.15+git20160109.147.dd1d655-1",
"0.15+git20160109.147.dd1d655-2",
"0.15+git20160128.179.5def6d9-1",
"0.15+git20160206.203.ed23711-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-gohugoio-hugo-dev",
"binary_version": "0.40.1-1"
},
{
"binary_name": "hugo",
"binary_version": "0.40.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "hugo",
"purl": "pkg:deb/ubuntu/hugo@0.40.1-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.25.1-2",
"0.26-1",
"0.35-1",
"0.37.1-1",
"0.38-1",
"0.39-1",
"0.40-1",
"0.40.1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "hugo",
"binary_version": "0.68.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "hugo",
"purl": "pkg:deb/ubuntu/hugo@0.68.3-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.57.2-1",
"0.58.3-1",
"0.59.1-1.1",
"0.68.3-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "hugo",
"binary_version": "0.92.2-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "hugo",
"purl": "pkg:deb/ubuntu/hugo@0.92.2-1ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.80.0-6",
"0.89.4-2",
"0.90.0-1",
"0.90.1-1",
"0.91.0-1",
"0.91.2-1",
"0.92.0-1",
"0.92.1-1build1",
"0.92.2-1",
"0.92.2-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "hugo",
"binary_version": "0.123.7-1ubuntu0.3+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "hugo",
"purl": "pkg:deb/ubuntu/hugo@0.123.7-1ubuntu0.3+esm2?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.113.0-3",
"0.119.0-2",
"0.120.3-1",
"0.120.4-1",
"0.121.2-1",
"0.122.0-1",
"0.123.7-1build1",
"0.123.7-1ubuntu0.1",
"0.123.7-1ubuntu0.2",
"0.123.7-1ubuntu0.2+esm1",
"0.123.7-1ubuntu0.3",
"0.123.7-1ubuntu0.3+esm1",
"0.123.7-1ubuntu0.3+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "hugo",
"binary_version": "0.154.5-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "hugo",
"purl": "pkg:deb/ubuntu/hugo@0.154.5-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.131.0-1",
"0.152.2-1",
"0.153.1-3",
"0.153.2-1",
"0.154.2-2",
"0.154.3-1",
"0.154.5-1"
]
}
],
"aliases": [],
"details": "Hugo versions 0.75.0 through 0.165.x contain a stored cross-site scripting vulnerability: the syntax highlighter does not escape the `lineAnchors` option before passing it to Chroma, which writes the value verbatim into the `id` and `href` attributes of the generated line-number markup. A crafted `lineAnchors` value supplied as a Markdown code fence attribute (or passed to the `highlight` template function) results in unescaped HTML in the rendered page, allowing arbitrary JavaScript to execute in the browsers of visitors to the generated site. This affects sites that build and publish Markdown from untrusted contributors; Hugo\u0027s security model otherwise considers content trusted input. Fixed in 0.166.0, where the `lineAnchors` value is HTML-escaped before being passed to Chroma.",
"id": "UBUNTU-CVE-2026-100691",
"modified": "2026-09-29T00:00:00Z",
"published": "2026-09-29T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-100691"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-100691"
},
{
"type": "REPORT",
"url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-q4xf-287f-98r8"
},
{
"type": "REPORT",
"url": "https://www.vulncheck.com/advisories/hugo-before-0.166.0-stored-xss-via-lineanchors-code-block-option"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-100691"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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